Final answer:
Theories are supported by evidence and subject to change as new evidence emerges.
Step-by-step explanation:
The statements that are true about theories in general are:
- Theories are supported by evidence and remain unproven until proven otherwise.
- Theories are constantly evolving and subject to change as new evidence emerges.
Scientific theories, such as cell theory and germ theory, are explanations of natural phenomena that have been repeatedly tested and supported by evidence. Theories are not absolute truths, but rather well-substantiated explanations that can be modified as new evidence is discovered.